I got the following in a current SeaMonkey trunk nightly with NTT 3.2 installed:
Error: (new component).QueryInterface is not a function
Source File: resource://gre/modules/XPCOMUtils.jsm
Line: 301
This is because nttAddonCompatibilityService.prototype in nttAddonCompatibilityService.js is missing a QueryInterface function. If you compare with https://developer.mozilla.org/en/XPCOMUtils.jsm, you need to implement something like this:
QueryInterface: XPCOMUtils.generateQI(
[Components.interfaces.nsIObserver]
)
(Maybe more interfaces need to be listed, didn't check.)

Jens, are you willing to take this bug? If you don't, we will have to search for someone who will, and that won't be me: I became this extension's "caretaker" by Hobson's choice, because no one seemed willing and I felt it would be a shame to let it rot uncared-for, but this kind of fix is way above my head: my expertise doesn't run much farther than the bounds of install.rdf
Heather, Philip: if Jens doesn't take this and you know anyone willing (and able, and with enough time) to fix this bug, please add him/her to the CC list.

Yes, the "official" NTT repository is at http://github.com/mozilla/nightlytt and there are a number of "forks" of that repo on github.
For an easy start to the git CLI:
- git help is similar to hg help
- git pull is equivalent to hg fetch (pull and update)
- git fetch is equivalent to hg pull (pull and don't update)
- git seems to have a less stringent "permanent history" rule than Mercurial, which makes me nervous. Of course, with responsibly minded repo administrators (who won't f?ck with the history) it's OK.
IIUC, Heather Arthur (fayearthur@ see bug CC), and I don't know who else, has push rights to that repo. I don't.

(In reply to Tony Mechelynck [:tonymec] from comment #5)
> Yes, the "official" NTT repository is at http://github.com/mozilla/nightlytt
> and there are a number of "forks" of that repo on github.
> For an easy start to the git CLI:
> - git help is similar to hg help
> - git pull is equivalent to hg fetch (pull and update)
> - git fetch is equivalent to hg pull (pull and don't update)
Oh, and I forgot: git clone is equivalent to hg clone. ;-)
> - git seems to have a less stringent "permanent history" rule than
> Mercurial, which makes me nervous. Of course, with responsibly minded repo
> administrators (who won't f?ck with the history) it's OK.
>
> IIUC, Heather Arthur (fayearthur@ see bug CC), and I don't know who else,
> has push rights to that repo. I don't.